The security architecture and security features in 3G mobile communications system are introduced, and its network access security mechanisms including indentification by user identities, authentication and key agreement, access link data integrity protection and data encryption are discussed.

This thesis is devoted to the study of Authentication and Key Agreement mechanism of 3G mobile communication system, which includes protocols, algorithms and implementation etc.

The shortcomings to 3G Authentication and Key Agreement(AKA) protocol were described through analyzing its procedure and security.

Discussion on the Deficit and Perfect of the Administrative Hearing System in China;

Research on the Improvements of Administrative Hearing System of China;

As an important procedure and means of maintaining the justice, fairness and openness of the administrative activity and protecting the concerned persons legitimate interests and proper rights, the administrative hearing legal system has been emphasized by most counties and showed in their laws.

There exist some difference between the Party Committee hearing and administration hearing.

The administration hearing mechanism is a procedural legal mechanism, which is meaning the administrate authority should hear the voice of interested person on the fact and law of the case in discussing before they use their power to make the un-interest decision to appositive party.